I placed a buy stop order intraday for NSE:NIFTY22NOV18350CE at 9:18:16. At 9:17:16, i have already placed a market order to sell this intraday. I can see in Fyers Web that order got rejected with message 'EXCH:16052:Function Not Available.' Can you please let me know what is wrong in the rejected order? I placed using Fyers API. No error message was returned in the order api.